New test hemisphere for evaluation and development of ablation profiles

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Laser Technology

Background:

• Excimer laser refractive surgery relies on precise ablation profiles.
• Accurate evaluation of these profiles is crucial for surgical outcomes and safety.
• Existing methods may not fully capture the three-dimensional characteristics of laser ablation.

Purpose of the Study:

• To develop and validate a novel evaluation device for excimer laser ablation.
• To enable three-dimensional testing of ablation characteristics.
• To assess the reliability and utility of the device for evaluating laser profiles.

Main Methods:

• A custom polymethyl methacrylate (PMMA) hemisphere with a 43.00-D curvature was designed and fabricated.
• The Nidek EC-5000 excimer laser was used to perform ablations with varying algorithms and curvature profiles.
• Pre- and post-ablation measurements included topography, OPD-scan, wavefront analysis, and keratoscopy.

Main Results:

• The PMMA hemisphere demonstrated reliability in producing repeatable ablation results.
• The device allowed for precise calibration and facilitated the experimental evaluation of different ablation profiles.
• It enabled direct comparison of outcomes from various laser algorithms and curvature settings.

Conclusions:

• The developed PMMA hemisphere serves as a dependable tool for assessing excimer laser ablation.
• It enhances understanding of standard ablation algorithms and profiles.
• The device supports daily safety protocols and the development of advanced refractive surgery solutions.